Vodacom and it horrible service

I had a bad month and the payment didn't go through on my bank account. If I try and call no one picks up. I am a freelancer and work a lot of long hours. I am fully booked for 2 weeks and can't get to a shop to pay the amount outstanding. So they send me a email telling me to complete payment or they will take my laptop. I can't pay online because no banking details were given on the email, when I long in to my account nothing is outstanding and there is no way to make a payment on your website. So just maybe before threatening me by taking a laptop just give me mort options for me to be able to pay you quicker? Useless service at call centre no one ever picks up.